开关按钮（UISwitch）

//Switch宽高无法设置
        //let GPLswitch = UISwitch(frame: CGRect(x: 100, y: 200, width: 200, height: 200))
        let GPLswitch = UISwitch()
        GPLswitch.center = CGPoint(x: 100, y: 200)
        
        //设置默认值
        GPLswitch.isOn = true
        GPLswitch.addTarget(self, action: #selector(switchClick), for: .valueChanged)
        
        
        self.view.addSubview(GPLswitch)

func switchClick()
    {
        print("点击了")
    }